If you have never downloaded an app outside of the Google Play Store, you will have to allow application installation from other sources. To do this go to:
Settings -> Application -> Unknown sources
or
Settings -> Security -> Unknown sources

The Zion's Harp Android App has been installed on a variety of devices. There are some upgrades and changes, but this means that the app is again untested.
Noteably, you can now press Enter(Return) to search.